[A-CG31] Nutrient footprint of primary production in the coastal and marginal seas of East and Southeast Asia

[ACG31-P07] Brief report: Nutrient distribution in the estuary of Pekalongan, North Java, Indonesia using chemical tracers

*Yuika Kitazawa¹, JING ZHANG², Roy ANDREAS³, Hendrayana Hendrayana⁴, Mukti TRENGGONO⁴, Saki Nishizawa KATAZAKAI² (1.Graduate School of Sustainability Studies, University of Toyama, 2.Faculty of Science, Academic Assembly, 3.Chemistry Department, Mathematical and Natural Science Faculty, Jenderal Soedirman University, 4.Marine Science Department, Fisheries and Marine Science Faculty, Jenderal Soedirman University)

Keywords:Water pollution, Sea level rise, Indonesia, Nutrient

Water pollution and sea level rise have occurred in wide coastal areas in Indonesia due to ongoing climate change and current increased human activities. In particular, northern part of Java Island has high density of housing, fishing, and industry, and there is an increasing need to monitor river and sea water quality to prevent water pollution. In addition, the region is considered to be one of the most vulnerable areas to sea level rise and flooding, leading to expansion of flooded areas and displacement of people. In order to solve these problems, the local municipality and the Indonesian government need to create policies that can respond to the problem and maintain the sustainability of these areas. The aim of this study is to clarify the sources, quantities, distribution patterns of the dissolved chemicals in the estuaries of Mrican River and Pencongan River in Pekalongan, North Java, and elucidate the impact of the chemical substances using oxygen and hydrogen stable isotopes and chemical compositions of river water and seawater. It is also expected international collaborative research will be conducted based on this study in Indonesia, consisting of other coastal regions in different Southeast Asian and African countries.